tidyverse: Easily Install and Load 'Tidyverse' Packages

The 'tidyverse' is a set of packages that work in harmony
because they share common data representations and 'API' design. This
package is designed to make it easy to install and load multiple
'tidyverse' packages in a single step. Learn more about the 'tidyverse'
at <https://github.com/hadley/tidyverse>.